Rich said:
>There may be yet another manufacturing defect since,
Quite possibly. It's not an easy thing to trace, is it? The best bet is if you
ship the amplifier, complete with tube, having done a 'burn in' run for say 100
hours. The cost of such a burn in (provision of burn in racks, monitoring,
drivers, loads and so on - even electricity) makes this a bit on the expensive
side for amateur equipment.
If for any reason you don't test the amplifier with the tube, you've even more
problems in really deciding if it's a bad amp or a bad tube when the problems
start appearing out there in the field, and you need a fair number of bad tubes
of a certain date code(s) to show up before you know whether or not there's
really a problem.
73
Peter G3RZP
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